646941 has 8 divisors (see below), whose sum is σ = 872640. Its totient is φ = 426272.

The previous prime is 646937. The next prime is 646957. The reversal of 646941 is 149646.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 646941 - 2² = 646937 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 646899 and 646908.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 646941.

It is not an unprimeable number, because it can be changed into a prime (646981) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 945 + ... + 1478.

It is an arithmetic number, because the mean of its divisors is an integer number (109080).

2⁶⁴⁶⁹⁴¹ is an apocalyptic number.

It is an amenable number.

646941 is a deficient number, since it is larger than the sum of its proper divisors (225699).

646941 is a wasteful number, since it uses less digits than its factorization.

646941 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2515.

The product of its digits is 5184, while the sum is 30.

The square root of 646941 is about 804.3264262723. The cubic root of 646941 is about 86.4878083210.

The spelling of 646941 in words is "six hundred forty-six thousand, nine hundred forty-one".